Aranbul, a subject of the king (Haeburu) of Northern Buyeo, dreamt that God appeared to him and said, "My descendents will establish a new country, therefore, you must move to other lands. On the east coast, there is a land called Gaseopwon, on which fertile soil you will set up a country." After awaking from the dream, Aranbul recommended to his king to move the country's capital and establish a new country called East Buyeo. Since Haeburu was childless into his late years, he often went to mountains and rivers to pray for a son. On his way to a mountain at a region called Gonyeon, his horse shed tears looking at a big stone. Thinking this unusual, he had his subject lift the stone, only to find a baby in the shape of a golden frog. Very pleased, he said, "God has given me a son!" He took the baby, named him "Geumwa" and raised him as a prince. As Geumwa grew up, Haeburu appointed him the Crown Prince. When Haeburu died, Geumwa succeeded him and became a king. And Geumwa abdicated the throne to Daeso, the Crown Prince.

In BC 59, Haeburu, the king of Northern Buyeo, moved his country to the east and settled in Buyeo-hyeon, north of what is now Jilin Province. This Buyeo kingdom was East Buyeo. East Buyeo collapsed in 494 by surrendering to Goguryeo.